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Deathunter88
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What's the average price of KI in the USA? I fail to see how $6 for a mere 100g is cheap. Here in China 500g of reagent grade KI is only $10 or so,
and even a brand name is $20 for 500g, so I don't really see the incentive to sell fake KI, especially at such a high price.
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Mr. Rogers
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I bought 300g from the OP's link and, as someone stated, it was slightly wet but it's definitely KI.
It was shipped in a leaking plastic bag inside an envelope and the customs form said it was a necklace.
I think it's "fine" for the price.
[Edited on 27-11-2018 by Mr. Rogers]
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Mr. Rogers
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Quote: Originally posted by Deathunter88  | | What's the average price of KI in the USA? I fail to see how $6 for a mere 100g is cheap. Here in China 500g of reagent grade KI is only $10 or so,
and even a brand name is $20 for 500g, so I don't really see the incentive to sell fake KI, especially at such a high price. |
It's much more expensive in the US - probably 4-5x as much. Dunno why.
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woelen
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Average price where I live (EU) is appr. EUR 20 per 100 gram, so $6 (appr. EUR 5) per 100 gram is very cheap for us. Prices in the USA will not be
very different.
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Ubya
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| Quote: Originally posted by Deathunter88 | | What's the average price of KI in the USA? I fail to see how $6 for a mere 100g is cheap. Here in China 500g of reagent grade KI is only $10 or so,
and even a brand name is $20 for 500g, so I don't really see the incentive to sell fake KI, especially at such a high price. |
if you can find a source that would sell internationally KI for that price we would be really happy
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DavidJR
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| Quote: Originally posted by Deathunter88 | | What's the average price of KI in the USA? I fail to see how $6 for a mere 100g is cheap. Here in China 500g of reagent grade KI is only $10 or so,
and even a brand name is $20 for 500g, so I don't really see the incentive to sell fake KI, especially at such a high price. |
I just looked at one of my suppliers in the UK and they have KI for £11.25/100g and NaI for £26/100g.
$6 US is about £4.70 at the moment. So yes, if it wasn't a scam, this would be very cheap for me.
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S.C. Wack
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| Quote: Originally posted by Deathunter88 | | What's the average price of KI in the USA? I fail to see how $6 for a mere 100g is cheap. Here in China 500g of reagent grade KI is only $10 or so,
and even a brand name is $20 for 500g, so I don't really see the incentive to sell fake KI, especially at such a high price. |
A price beyond competitive on amazon is $85/kg...best is $56/kg, for 5, which makes me wish I needed that much, that's insanely low. These are just
repackers of probably Chinese goods. There are sellers of I, 50 g. for $10; technically, to import legally one needs a license from the DEA, which
they won't provide.
Someone who has been pricing chemicals for a time might be suspicious of cheap imported iodide, and would want to test it well. Does China control
some vast natural source of iodide? I suspect that the price from a non-Chinese source is higher than the amounts given above.
[Edited on 28-11-2018 by S.C. Wack]
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Sulaiman
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With the recently purchased potassium iodide I tried to precipitate the iodine using hydrogen peroxide and got an indication of low iodine content.
Today I made up a 500ml solution of what should be a 1.0M solution of the suspect potassium iodide,
(which I bought via eBay seller 94racing-au, the cheapest at the time)
and bubbled chlorine gas through 100ml of the solution
to replace the iodide with chloride and precipitate iodine.
36% HCl in a 3ml disposable pipette, TCCA in a side-arm test tube.
The crop of wet iodine on a 90mm diameter filter paper.
Ideally there should be 1/10th mole of iodine = 12.7 g
A little was lost to physical handling, and there should be a little Iodine in the filtrate/solution.
I guess that potassium chloride may increase the solubility of iodine in a manner similar to potassium iodide ?
Could anyone please tell me, or point to, or calculate,
the solubility of iodine in 1.0M Potassium Chloride ?
especially in the 10 to 20 Celcius range.
Result : 8.05g dry iodine
The filtrate has a strong yellow tint and the tissues used beneath the filter paper absorbed a lot of iodine giving a strong blue tint,
so I still suspect that KCl increases the solubilit of iodine in water..
Although the yield was only 63% I suspect that the KI was pure.
now I need to do a titration to be sure.
[Edited on 6-12-2018 by Sulaiman]
CAUTION : Hobby Chemist, not Professional or even Amateur
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DavidJR
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I just got a refund for my fake stuff.
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Ubya
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| Quote: Originally posted by Sulaiman |
I guess that potassium chloride may increase the solubility of iodine in a manner similar to potassium iodide ? |
iodine is solubile in iodide solution because it forms triiodide, which is soluble
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S.C. Wack
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| Quote: Originally posted by Sulaiman | I guess that potassium chloride may increase the solubility of iodine in a manner similar to potassium iodide ?
Could anyone please tell me, or point to, or calculate,
the solubility of iodine in 1.0M Potassium Chloride ?
especially in the 10 to 20 Celcius range. |
You have the iodine, KCl is hopefully not a challenge...
So I looked in Mellor and he gives the exact answer actually and it's a good thing, because CA abstracts the same article but doesn't provide
details...just like the publisher of Gmelin's didn't provide a pdf of any I volume for sale last time I looked...if you believe 1920 Gazz It, KCl
accounts for less than 1/10 gram of the missing I.
[Edited on 6-12-2018 by S.C. Wack]
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Sulaiman
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Actually I would have to buy or make some KCl so the data is useful, thanks.
I dowloaded Mellor years ago but forgot the contents 
After tidying up I dropped a pinch of TCCA into the filtrate,
I'll check for any precipitate tomorrow.
To be sure I'll boil dry the filtrate to dryness then heat the residue to see how much iodine vapour is produced.
I just realised that the iodine may have precipitated in particles too small to be caught by the medium filter paper that I used,
which now seems more likely than dissolution carrying the iodine into the tissues used beneath the paper for drying the iodine,
but if true then the light yellow colour of the filtrate should be much darker.
I'm confused.
CAUTION : Hobby Chemist, not Professional or even Amateur
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S.C. Wack
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The thinking was neutralizing HCl and K (bi)carbonate or hydroxide exactly should be a low hurdle.
IIRC H2O2/HCl and KI is popular enough that there were calculators for the different parameters, for meth cooks, who seemed satisfied. Perhaps with Cl
as a gas, bad things are more likely to happen?
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MrHomeScientist
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I know for bromine it can form interhalogens with chlorine; that's why I avoided Cl when I made my Br. I wonder if something similar can happen with
iodine.
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UC235
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| Quote: Originally posted by MrHomeScientist | | I know for bromine it can form interhalogens with chlorine; that's why I avoided Cl when I made my Br. I wonder if something similar can happen with
iodine. |
ICl and ICl3 are well known. Bubbling Cl2 through iodide solution is how woelen made periodate.
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